Switch



y 1929-- M. M. LEVINSON 1, 4,680

SWITCH Filed March 26, 1924 INVENTOR, 7g 74 Marcus flf. [er/115011;

ATTORMJYS."

line 55 of Figure 2;

Patented May 28,. 19 29.

MARCUS M. L EVINSON, OF ALTADENA, CALIFORNIA.

SWITCH.

Application filed March 26, 1924. Serial No. 702,041.

This invention relates to switches and particularly to that class of switch which may be automatically operated to control various electrical circuits responsive to actuation of such switch by heat-sensitive means such as a thermostat. The "switch. may be so arranged as to control various resistance units such as used in electric irons, curling irons, Water heaters, electrically-controlled carburetors and the like in sucha manner as to have certain windings arranged in series upon one operation of the switch, a parallel arrangement upon a second operation of the switch and an off position. i

The invention provides an article of manufacture which is simple of construction, easy to manufacture, fool-proof in operation and generally superior as regards utility and "adaptability to various purposes.

With the above and other objects in view, the invention consists in the novel and useful provision, construct-ion, formation association and relative arrangement of parts, members and features, all as shown in certain of its embodiments in the accompanying drawing, described generally and more particularly pointed out in the appended claims' In the drawing: V Figure 1 is a fragmentary view, partly in section, of the improved device as an entirety and showing certain electrical resistance units which may be associated with the switch ele- -ment of thedevice;

Figure 2 is a fragmentary cross sectional view on an enlarged scale and showing the interior construction of the switch box unit;

Figure 3 is across sectional view on the line 3-3 of Figure 2;

Figure 4 is a fragmentary cross sectional view on the line 44 of Figure 2;

Figure 5 is a cross sectional View on the Figure 6 is a view similar to Figure 3 and showing a second position of the movable part of the switch;

Figure 7 is a cross sectional view showing further movement of the movable part of the switch in what may be termed an otf position; and

Figure 8 is a fragmentary cross sectlonal view showing a modified form of the switch,

' represented by the same reference characters.

Referring with particularity to the drawing, of which I have illustrated two forms of my device, I have designated such forms by A and B respectively. Both forms work on the same principle, the difference residing 1n the placement of the heat-sensitive element with respect to the switch proper. In Figure l I have illustrated the complete form of the device as A, inwhich (1 represents as an entirety the switch, and b the heat-sensitive element adapted to actuate the switch. The switch includes a casing which may be formed in two parts as 1 and 2, and the part 1' 1s formed with an annular chamber 3. Within such annular chamber is a movable member 4. of the switch, which movable member may be in the form of a circular disc and bored transversely as shown at and 6 to accommodate roller members 7. The movable member is likewiseprovided with a central squared bore 8. The general form of the casing c may be circular, and the part 2 thereof is formed with a central bore 9; such part 2 is likewise provided with segmental contact pieces 10 and 11. The contact piece 10 is of greater length than the contact piece 11, and such member 2 is also provided with a contact member 12 and terminal members 13 and 14 associated with the members 10 and 11 respectively. The contact member 12 does not carry a segmental piece. The contact member 12 is located diametrically opposite a gap portion as 15 between adjacent ends of the segmental pieces 10 and 11, as best illustrated in Figure 3. The movable member :l: is provided with a segmental slot 16 and the casing member 2 carries a pin 17 received through such slot so as to limit the movement of such member 4.

Terminal members 20 and 21 are passed through the casing member 1 and such terminal members 20 and 21 carry plate portions 22 and 23. The general form of such plates is shown in Figures 2 and 4, in which it will be noted that they are slightly beaded as shown at 24 and 25. The plate portions 22 and 23 are received in small recesses 26 and 27 opening into the chamber 3 of the casing part 1. The casing part 1 is substantially circular and the terminal members 20 and 21 are arranged diametrically opposite. The plates 22 and 23 are in reality contact pieces or plates, and against which the roller members 7 are adapted to bear during certain movements of the movable member 4. The beaded portions shown at 24 and are adapted to contact with such roller members s as to snap the movable member intodifferent. the heating of water or the like where the Before'describing furtherdetailsof heating elements 30 and 31 are suitably conpositions. I

the circult shown in Figs. 3'and tamed wlthin a caslng or the like placed in a the invention 6 will be described. If we have two resistance 'Vesscl containing water, and the heat-sensi- J l elements as 30 and 31 and desire to associate tive element bis likewise placed in the water them either in a series or a parallel relation so that the heating effect of the coils 30 and through the medium of the switch member we 31 on the water may be regulated. For inmay do so by connecting-a terminal of the restance, if the thermostat was set so as to sistan'ce element 30 with the terminal memboil the water, and if the water should be ber 14 as shown at 4Q, with ends'of the recompletely evaporated the heat would rise sistance elements 30 and 31 connected as above .100 degrees centigrade, and the coils shown at 41 and a lead or connection from of the thermostat would continue to turn unsuch connected ends 41. associated with the til the switch member was snapped to an terminal 12. The opposite terminalof the reoff position, thus preventing damage to the sistance element or coil 31 is connected with vessel. In this connectiona device similar the terminal 13, as shown at 41*. If the movto'that shown in Figure 1 could be installed. able member of the switch is turned so that in an le tri iron, th the t t b i g so one of the roller members 7 spans the gap 15 regulated as to turn ofl orturn the movable so as to touch thesegments 10 and 11, the member to a series position so as to hold the other roller member will rest upon the teriron at a given heat, or if desired, turn the minal member 12 and the resistance elements current oif entirely through the heating will be connected in parallel; If the movable 'coils of the electric iron. One n t bl f member is turned to a second position as il- 'ture of this switch with its heat-sensitive lustrated in Figure 6,one of the roller memelement to control movement thereof is that bers will rest on the segmental piece-11 and it can b so e l t d as t again t on the other on the segmental piece 10, and h when the heat of the object being" heated, resistance elements or coils will be connected drop b l det r i d p i t, Th i i i If the movable member 1s turn ventor is aware of the fact that certain forms further to the position shown in Flgtlre 7, of therm-ostatically+controlled electric irons one of the roller members will ride upon the a n w v th f k t, b t t hi k tl d movable member WithOHt Contact With y. there are no irons on the market which will h bl member should be formed Of temperature ofthe iron falls below a selected om insulating material. It 1s to ,be noted point. The invention lends itselfto so many that a turnin of the movable memb r, as adaptations that no particular adaptations before stated, 1s limited as to 1ts rotatfon by will b d ib d, th general i i l b i 1 metal piece, and it is intended, of course, that turn the, electric current on' again when the the position of the pin 17 within the slot to provide a switch which will connectva- I 16, and further that the plates 22 and 23 rious heating coils in eithena series or a parare of a length suflicient to engage the roller ll l ra t or an ff iti d I m r 7 d ng 51 i g f e movable again turn the current on from such off pomember to place the resistance elem sition when the temperature of the article to and 31 in either a series relation or a parallel b h ted drops below a certain selected point latlon; a or points. The terminal members 20 and 21 Th heat-sensitive element deslgpfl i ge of the showing of Figure 1 are bent as shown finally y y 9nta1ned 333mg at' 60 and 61 so as to nap within a socket '50, said heat-sensltlve element being atherb as i {h usual ti ith i mostat formed of two dissimilar metals havnals of this form,

ing different rates of expansion, such metal Th difi ti f th d i de i t d members being shown at 51 and 52, and w i as Bas shown in Figure 8 does not difier'estal members 51 and 52 are coupled t g t sentially, so far as operative features are and then spirally wound within the casing 50. concerned, fro the showing of Figures 1 to Oneend of such spiral is connected with the 7 inclusive, the main difierence residing in casing 50 asshown at 52%, and the opp s t the fact that the thermostat coils are confined end may be connected with a shaft 5 4 0011- in the same casing with the switch member. tained within a tube 5.5,which tube s con- Th d i B i l d s i f d ih nected with the casingand wlth the part 2 :two parts, as shown at.70 and'71, one bf such The shaft 54 is squared at one end so as to be. chamber 7 2', and confined within such circureceived in the square opening 8 of the m ov-. lar chamber is a, disc which will be desigable member ,4. Thusas the coils forming 'nated as 4, as it corresponds in all details such thermostat expand and contract the with the disc 4 of the showing of .Figs. 1 to shaft 54 will rota e and ill d i g so wil rotate 7 inclusive. Like reference characters will the movable member. therefore be applied to the said disc and the The form of the device shown in, Figure 1 roller members. The casing member 71 is fmay be utilized for various purposes such as formed with an annular flange 74 and the 'of the switch casing c, as illustrated in Fig. 1. t as 71, bei f d ith i l A casing member is likewise flanged as shown at 75, the flanges 74 and 75 being substantially at right angles to each other and .forming between themselves and the body portions of the casing members 70 and 71 an annular chamber 76. The coils of the thermostat designated as f are confined within such annular'chamber with one of the thermostat coils connected by a pin 77 with the flange 75 of the casing member 70. The casing member 71 is slotted for. a portion, as shown at 78, and a pin is passed through such slot and connected with the inner end of such thermostat coils and with the disc i. In addition. a bolt 7 9 is passed through both casing members and a central opening in the disc member 4. This bolt likewise tends to hold the casing members in working relation and acts likewise as a central pivot member for the movable member 4. Terminal members 12, 13 and 14 are provided, as before. as are likewise the heating elements 30 and 31. and terminal members similar to the terminal members 20 and 21 are provided. The devise shown in Fig. 8 is exceedingly compact and may be utilized within a given member such as an electric iron. if desired. so that there are no protruding or external members on the iron casing.

The operation of the form shown in Fig. 8 is identical with the operation of the device shown in Figs. 1 to 7 inclusive.

It is obvious that various changes and modifications and variations may be made in practicing the invention.,in departure from the particular showing of the drawing. without departing from the true spirit of the invention.

Having thus disclosed my invention, I claim and desire to secure by Letters Patent:

1. In a switch including a casing, a disk rotatably mounted in said casing, contacts on said disk, contacts in said casing to be engaged by said disk contacts and a thermostatic element in said casing surrounding said disk and connected to the periphery of the disk to rotate the same to cause said disk contacts to engage or disengage said casing contacts. 7

2. In a switch, a casing, a member rotatably mounted in said casing, contacts on said member, contacts in said casing to be engaged by said member contacts, and a thermostatic element in said casing concentric with the axis of rotation of said member and connected to the latter to rotate the same.

3. In a switch, a casing formed of complemental parts which are cut away to form jointly two concentric chambers, a rotatable contact member mounted in one of said chambers, contacts *arried by the -asing parts within the last mentioned chamber and adapted to be engaged by the member cont'acts, and a thermostatic element located in the second chamber and connected with the rotating member to rotate the latter.

t. In a switch, a casing formed with a pair of concentric chambers and having a slot connecting said chambers, a member rotatably mounted in one of said chambers, contacts on said member, contacts in said last mentioned chamber to be engaged by said member contacts, a thermostatic element mounted in the second chamber, and a pin movably positioned within the slot and connecting the thermostatic element to the rotatable member whereby operation of the thermostatic element will rotate the member.

5. In a switch, a casing formed of complemental parts shaped to jointly form in their meeting faces two concentric chambers, a pin passing through one of said chambers and both casing parts to interconnect the latter, a member rotatably mounted upon said pin within the chamber through which the pin passes, contacts on said member, contacts in said last mentioned chamber to be engaged by said member contacts. and a thermostatic element in said second chamber and operatively connected to the rotatable member.

In testimony whereof I have signed my name to this specification.

MARCUS M. LEVINSON. 

